How do I work out the right size and heat output for my room?

First, match the radiator’s BTU (Delta 50) band to the heat requirement of the room — the site groups radiators into ranges such as 1–999, 1000–1999, 2000–2999 and up to 10,000–25,000 BTU so you can pick a product that meets your target. As a quick guide, a small bedroom often sits in the 1000–1999 BTU band, while a medium living room commonly needs 3000–4999 BTU; larger open-plan spaces may need 5000–7000 BTU or more. Then choose a physical size that fits your wall: common heights include 600mm (many options) and tall verticals at 1600–1800mm if you have limited wall width. For example, if your living room needs about 3500 BTU you might choose a horizontal double panel radiator in the 600 x 1215mm or 600 x 1440mm sizes shown on the site.

Which radiator material is best for speed of heat and long-term performance?

Aluminium radiators heat up quickly and are lightweight, so they’re ideal if you want fast warmth and lower mass. Steel and mild steel radiators (several hundred listings) are heavier, retain heat longer and give a steadier, more even output once warm, so they suit living areas where sustained heat is useful. Each material has trade-offs: aluminium is faster but can cool quicker, while steel stores heat but responds more slowly. If you want fast-response heating in a small bathroom, aluminium suits well; for a family lounge where retained heat matters, a mild-steel panel radiator is often better.

Should I choose a vertical or horizontal radiator for a small bathroom or hallway?

Vertical radiators (about 501 products) are perfect where wall width is limited — tall models such as 1600–1800mm let you fit a high-output unit in a narrow space and free up low wall area for furniture. Horizontal radiators (around 609 products) work best under windows or across longer walls and are often available in wider options like 910–1440mm to deliver higher outputs at 600mm height. For a narrow hallway, a vertical double-flat-panel at 1800 x 455mm gives strong heat without crowding the floor; for a bathroom under a window, a horizontal 600 x 1215mm double panel provides good output and sits neatly beneath the sill.

What’s the practical difference between traditional column radiators and modern flat panel designer types?

Traditional column radiators (for example the Park Lane Colosseum range) use multiple bars or columns to give high surface area and a classic look; double or triple bar columns also make handy towel spaces in a bathroom. Modern flat-panel designer radiators (like DuraTherm double panels) have a slim, minimalist face and often deliver equivalent output in a shallower profile, so they suit contemporary interiors and tighter clearances. Choose a column if you want period styling and a tactile feel; pick a flat panel if you prefer a sleek, low-profile radiator that tucks close to the wall.

Do different colours or finishes affect performance or are they just aesthetic choices?

Colour and finish are mostly aesthetic — the catalogue shows many options such as white (551 items), anthracite (239), black (185), chrome and brass — but finish can influence maintenance and where you’ll use the radiator. For example, chrome or brass-toned radiators work well in bathrooms because they complement taps and fittings, while white is the most common, usually cost-effective choice for living spaces. Very dark finishes like anthracite will show dust and fingerprints more readily, so you might prefer white or chrome in a busy family area.

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Terma Rolo Room Heban Black Designer Radiator 1800 x 370 mm

Terma Rolo Room White Designer Radiator 1800 x 480 mm

Terma Rolo Room Quartz Mocha Designer Radiator 1800 x 480 mm

Terma Rolo Room Modern Grey Designer Radiator 1800 x 480 mm

Terma Rolo Room True Copper Designer Radiator 1800 x 590 mm

Terma Rolo Room White Designer Radiator 500 x 865 mm

Terma Rolo Room Modern Grey Designer Radiator 500 x 865 mm

Stelrad Compact K2 Type 22 700 x 1200mm Double Panel Radiator Double Convector - 143856

Stelrad Elite K1 Type 11 300 x 1000mm Single Panel Radiator Single Convector - 8431

Stelrad Elite K1 Type 11 450 x 900mm Single Panel Radiator Single Convector - 8466

Stelrad Elite K1 Type 11 450 x 1100mm Single Panel Radiator Single Convector - 8468

Stelrad Elite K1 Type 11 450 x 1200mm Single Panel Radiator Single Convector - 8469

Stelrad Elite K1 Type 11 450 x 1400mm Single Panel Radiator Single Convector - 8470

Stelrad Elite K1 Type 11 600 x 400mm Single Panel Radiator Single Convector - 8528

Stelrad Elite K1 Type 11 600 x 500mm Single Panel Radiator Single Convector - 8529

Stelrad Elite K1 Type 11 600 x 1000mm Single Panel Radiator Single Convector - 8534

Stelrad Elite K1 Type 11 700 x 400mm Single Panel Radiator Single Convector - 8595

Stelrad Elite K1 Type 11 700 x 500mm Single Panel Radiator Single Convector - 8596

Stelrad Elite K1 Type 11 700 x 600mm Single Panel Radiator Single Convector - 8597

Stelrad Elite K1 Type 11 700 x 700mm Single Panel Radiator Single Convector - 8598

Stelrad Elite K1 Type 11 700 x 800mm Single Panel Radiator Single Convector - 8599

Stelrad Elite K1 Type 11 700 x 900mm Single Panel Radiator Single Convector - 8600

Stelrad Elite K1 Type 11 700 x 1000mm Single Panel Radiator Single Convector - 8601

Stelrad Elite K1 Type 11 700 x 1200mm Single Panel Radiator Single Convector - 8603

Stelrad Elite K2 Type 22 300 x 1000mm Double Panel Radiator Double Convector - 8443

Stelrad Elite K2 Type 22 300 x 1500mm Double Panel Radiator Double Convector - 8444

Stelrad Elite K2 Type 22 450 x 500mm Double Panel Radiator Double Convector - 8498

Stelrad Elite K2 Type 22 450 x 700mm Double Panel Radiator Double Convector - 8500

Stelrad Elite K2 Type 22 450 x 800mm Double Panel Radiator Double Convector - 8501

Stelrad Elite K2 Type 22 450 x 1000mm Double Panel Radiator Double Convector - 8503

Stelrad Elite K2 Type 22 600 x 400mm Double Panel Radiator Double Convector - 8564

Stelrad Elite K2 Type 22 600 x 600mm Double Panel Radiator Double Convector - 8566

Stelrad Elite K2 Type 22 600 x 700mm Double Panel Radiator Double Convector - 8567

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